Is there a site that shows which parts match for different cars?

Like I know the 3100/3800 engine is the same in Pontiacs, Buicks, Chevys and other GMs. But what about other parts for other cars like Hondas, Toyotas and others?Is there a site that shows which parts match for different cars?
I use carpart.com, this is tied right into the Hollander books.

partsamerica also shows what other parts interchange that are too small to be listed at a salvage yard.

Some time you find out interesting things reading up on the cars, like a 96 Honda Passport uses a Mit engine.Is there a site that shows which parts match for different cars?
it's not exactly what you are searching for but might help; http://www.innerauto.com/Is there a site that shows which parts match for different cars?
I don't think there is a site like that, BUT i found something very interesting on e-bay, most of the time if you're looking something for a car, on the description will say not only for the car you're looking for, also for other vehicles!, so, that's hbow you can find stuff. maybe?, it helped me a lot!